Time-varying gradient metasurface with applications in all-optical beam steering
Integrating the large, subpicosecond nonlinear optical response of epsilon-near-zero (ENZ) materials with the broad design freedoms of plasmonic metasurfaces shows potential for creating rapidly modulated optical devices with possible applications in telecommunications, sensing, and reactive beam st...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2023-03-01
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| Series: | Nanophotonics |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/nanoph-2022-0756 |
| _version_ | 1797817341396910080 |
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| author | Karimi Mohammad Alam M. Zahirul Upham Jeremy Reshef Orad Boyd Robert W. |
| author_facet | Karimi Mohammad Alam M. Zahirul Upham Jeremy Reshef Orad Boyd Robert W. |
| author_sort | Karimi Mohammad |
| collection | DOAJ |
| description | Integrating the large, subpicosecond nonlinear optical response of epsilon-near-zero (ENZ) materials with the broad design freedoms of plasmonic metasurfaces shows potential for creating rapidly modulated optical devices with possible applications in telecommunications, sensing, and reactive beam steering. In this work, we experimentally investigate a metasurface consisting of a plasmonic gradient array on a thin layer of indium tin oxide (ITO), characterize how incident probe pulses diffract from a system as it is being dynamically modulated by a pump pulse at wavelengths near the ENZ region. Angular shifts in the diffraction orders are observed and can be principally attributed to the adiabatic wavelength conversion of the probe as it witnesses the temporal change of index induced by the pump. Of note, the asymmetric gradient metasurface, considered to be a blazed diffraction grating, shows significantly different dynamic responses for different diffraction orders. The free-space wavelength shift to +1 and −1 diffraction orders is 6 and 12 nm, resulting in steering angle changes of 0.65 and 1.5°, respectively. |
| first_indexed | 2024-03-13T08:52:02Z |
| format | Article |
| id | doaj.art-30ba5f97c0f94af8a6d9481900cd8a68 |
| institution | Directory Open Access Journal |
| issn | 2192-8614 |
| language | English |
| last_indexed | 2024-03-13T08:52:02Z |
| publishDate | 2023-03-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj.art-30ba5f97c0f94af8a6d9481900cd8a682023-05-29T09:46:24ZengDe GruyterNanophotonics2192-86142023-03-011291733174010.1515/nanoph-2022-0756Time-varying gradient metasurface with applications in all-optical beam steeringKarimi Mohammad0Alam M. Zahirul1Upham Jeremy2Reshef Orad3Boyd Robert W.4School of Electrical Engineering and Computer Science, University of Ottawa, Ottawa, ON, K1N 6N5, CanadaDepartment of Physics, University of Ottawa, Ottawa, ON, K1N 6N5, CanadaDepartment of Physics, University of Ottawa, Ottawa, ON, K1N 6N5, CanadaDepartment of Physics, University of Ottawa, Ottawa, ON, K1N 6N5, CanadaDepartment of Physics, University of Ottawa, Ottawa, ON, K1N 6N5, CanadaIntegrating the large, subpicosecond nonlinear optical response of epsilon-near-zero (ENZ) materials with the broad design freedoms of plasmonic metasurfaces shows potential for creating rapidly modulated optical devices with possible applications in telecommunications, sensing, and reactive beam steering. In this work, we experimentally investigate a metasurface consisting of a plasmonic gradient array on a thin layer of indium tin oxide (ITO), characterize how incident probe pulses diffract from a system as it is being dynamically modulated by a pump pulse at wavelengths near the ENZ region. Angular shifts in the diffraction orders are observed and can be principally attributed to the adiabatic wavelength conversion of the probe as it witnesses the temporal change of index induced by the pump. Of note, the asymmetric gradient metasurface, considered to be a blazed diffraction grating, shows significantly different dynamic responses for different diffraction orders. The free-space wavelength shift to +1 and −1 diffraction orders is 6 and 12 nm, resulting in steering angle changes of 0.65 and 1.5°, respectively.https://doi.org/10.1515/nanoph-2022-0756epsilon-near-zero (enz)metasurfacenonlinear optics |
| spellingShingle | Karimi Mohammad Alam M. Zahirul Upham Jeremy Reshef Orad Boyd Robert W. Time-varying gradient metasurface with applications in all-optical beam steering Nanophotonics epsilon-near-zero (enz) metasurface nonlinear optics |
| title | Time-varying gradient metasurface with applications in all-optical beam steering |
| title_full | Time-varying gradient metasurface with applications in all-optical beam steering |
| title_fullStr | Time-varying gradient metasurface with applications in all-optical beam steering |
| title_full_unstemmed | Time-varying gradient metasurface with applications in all-optical beam steering |
| title_short | Time-varying gradient metasurface with applications in all-optical beam steering |
| title_sort | time varying gradient metasurface with applications in all optical beam steering |
| topic | epsilon-near-zero (enz) metasurface nonlinear optics |
| url | https://doi.org/10.1515/nanoph-2022-0756 |
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